File 24232-waitqueue_Hold_a_reference_to_a_domain_on... of Package xen

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File 24232-waitqueue_Hold_a_reference_to_a_domain_on_a_waitqueue..patch of Package xen (Revision 43b25d1f7f5589dd235134f645453186)

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changeset:   24232:95d4e2e0bed3
user:        Keir Fraser <keir@xen.org>
date:        Fri Nov 25 20:32:05 2011 +0000
files:       xen/common/wait.c xen/include/xen/wait.h
description:
waitqueue: Hold a reference to a domain on a waitqueue.

Also allow waitqueues to be dynamically destroyed.

Signed-off-by: Keir Fraser <keir@xen.org>

---
 xen/common/wait.c      |    8 ++++++++
 xen/include/xen/wait.h |    3 ++-
 2 files changed, 10 insertions(+), 1 deletion(-)

Index: xen-4.1.2-testing/xen/common/wait.c
===================================================================
--- xen-4.1.2-testing.orig/xen/common/wait.c
+++ xen-4.1.2-testing/xen/common/wait.c
@@ -87,6 +87,11 @@ void init_waitqueue_head(struct waitqueu
     INIT_LIST_HEAD(&wq->list);
 }
 
+void destroy_waitqueue_head(struct waitqueue_head *wq)
+{
+    wake_up_all(wq);
+}
+
 void wake_up_nr(struct waitqueue_head *wq, unsigned int nr)
 {
     struct waitqueue_vcpu *wqv;
@@ -98,6 +103,7 @@ void wake_up_nr(struct waitqueue_head *w
         wqv = list_entry(wq->list.next, struct waitqueue_vcpu, list);
         list_del_init(&wqv->list);
         vcpu_unpause(wqv->vcpu);
+        put_domain(wqv->vcpu->domain);
     }
 
     spin_unlock(&wq->lock);
@@ -218,6 +224,7 @@ void prepare_to_wait(struct waitqueue_he
     spin_lock(&wq->lock);
     list_add_tail(&wqv->list, &wq->list);
     vcpu_pause_nosync(curr);
+    get_knownalive_domain(curr->domain);
     spin_unlock(&wq->lock);
 }
 
@@ -236,6 +243,7 @@ void finish_wait(struct waitqueue_head *
     {
         list_del_init(&wqv->list);
         vcpu_unpause(curr);
+        put_domain(curr->domain);
     }
     spin_unlock(&wq->lock);
 }
Index: xen-4.1.2-testing/xen/include/xen/wait.h
===================================================================
--- xen-4.1.2-testing.orig/xen/include/xen/wait.h
+++ xen-4.1.2-testing/xen/include/xen/wait.h
@@ -25,8 +25,9 @@ struct waitqueue_head {
         .list = LIST_HEAD_INIT((name).list)     \
     }
 
-/* Dynamically initialise a waitqueue. */
+/* Dynamically initialise/destroy a waitqueue. */
 void init_waitqueue_head(struct waitqueue_head *wq);
+void destroy_waitqueue_head(struct waitqueue_head *wq);
 
 /* Wake VCPU(s) waiting on specified waitqueue. */
 void wake_up_nr(struct waitqueue_head *wq, unsigned int nr);

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File 24232-waitqueue_Hold_a_reference_to_a_domain_on_a_waitqueue..patch of Package xen (Revision 43b25d1f7f5589dd235134f645453186)

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